biom.table.Table._get_col¶
- Table._get_col(col_idx)¶
Return the column at col_idx.
A column vector will be returned as a scipy.sparse matrix in csc format.
Notes
Switching between slicing rows and columns is inefficient. Slicing of rows requires a CSR representation, while slicing of columns requires a CSC representation, and transforms are performed on the data if the data are not in the required representation. These transforms can be expensive if done frequently.